Burner for blowtorches, fire pots, and the like



Aug.17,1926.' 1,596,187

L. S. lJQHNSON y BURNER FOR BLOWTOR-GHES, FIRE IAOTS', AND THE LIKEFiled August 12, 19125 j L O .5. JOH/V50N.

. ATTORNEY Patented Aug, 17 1926.

UNITED stares PATENT orties., L

BURNER FOR BLOVJTORGHES, FIR-E POTS, AND THE LIKE.

Application mea August 12, 1925. semi Nb. 49,701.

This invention relates to burners'for blow torches, fire pots and thelike.

One object of the invention is to provide a burner of this kind whichwill produce an i intensely hot blue ame.

A further object of the invention is to provide such a burner in whichthe flow of fuel to the burner will be uniform and the llame steady.

A further object of the invention is to provide a burner of thischaracter which will be simple in its'construction and inexpensive toproduce'l Other objects of the invention will appear as the device isdescribed in detail. l

In the accompanying drawings Fig. 1 is a side elevation of a burnerembodying'iny invention, showing a portion of the fuel tank in section;Fig. 2 is a longitudinal sectional View taken centrally of the burner;Fig. 3 yis a transverse section taken on the line 3-3 of Fig. 2; Fig. 4is a transverse section taken on the line l-4 of Fig. 2; and Fig. r5 isa front elevation of the burner.

In these drawings I have illustrated one embodiment of my invention butit willbe understood that this hasbeen chosen for the purpose ofillustration only and'that the burner may take various forms withoutdeparting from the spirit of the invention.

As here illustrated the burnerV comprises an elongated body portion orflame tube1 which is provided in its rearwall with an Ainlet port 2which is controlled'by a needle valve 3 screw threaded into a boss 4formed on the rear end wall of the'burner. ln the present arrangementthe burner is'supported on the fuel tank 5 by means of a tubula'rsupporting member or pipe .6 which forms a part of the supply pipe and thelower end of which communicates with a tube 7 which extends downwardlyinto the fuel tank, preferably to a point near the bottom thereof, thetube 7 and pine 6 being preferably filled with wicking, as shown at 8.rlhe tank 5 is provided with the usual air pump 9, by means of which airmay be pumped into the tank to subject the liquid fuel therein to airpressure which will force it from the tank into the burner. The upperend of the supply pine 6 communicates with one end of the fuel conduitwhich leads therefrom to the intake port 2 and ,is so arranged that itwill be subjected to the heat of the flamek in the llame tube. As hereshown, the conduit is formed integral with the flame tube and comprisesa portion 10, communicating with the upper end of the pipe 6 andextending through the flame tube transversely to its length, the conduitbeing of an exterior diameter less than the internal diameter of theflame tube so asto provide relatively large passageways for the flame onboth sides .of the conduit. A second portion of the conduit is formed inthe top wall of the flame tube, as shown at 11,`and extends rearwardlyfrom the portion 10 ofthe conduit to the rear wall of ther flame tubewhere it is connected with a vertical portion 12 of the conduit which isformed' in the rear wall and leads to the inlet uort 2, the top and rearwalls of the fla-me tube being thickened to provide space for theconduits.`A The bore in the rear wall of the llame tube, the upperportion of whichconstitutes a Dart ofthe fuel conduit, extendsdownwardly beyond the inlet port and, lin the present instance, intoavboss 13 which depends fromv the flame tube beneath the inlet port; Thelower end of the bore is closed, inthe present device by a screw 14, andthus constitutes a reservoir or equalizing chamber 21 which is in -opencommunication' with the'fuel conduit and when thevalve 3 is :in its openposition neath therear portion ofthe burner and, in

the 'present -instance, mounted onwthe supply pipe 6, isa generating cup15 adapted to receive al quantity of fuel rwhich when Yignited will heatthe burner and vaporizeV The n the fuel in the reservoir and conduit.

LLOYD s. JOHNSON, oFnAYToN, onto, assiettes roiroaaon ivi. HUFFMAN, or tDAYTON, onto. y

is in communication with the inlet port.

flame tube is provided Iin the rear portion provided with rests orsupports 19 and 2O by means of which a soldering` irony or otherimplement may be supported on the tube with its end adjacent to theflame which is projected from the tip 18 thereof.

The burner is started in operation by pumping air into the tank 5 toplace the fuel under air pressure and then opening the valve 3 to permita portion of the fuel to pass through the inlet port and the openings inthe flame t-ube into the generating cup l5. This fuel is then ignitedand the flame therefrom will heat the reservoir 13 andthe rear end ofthe flame tube and thus cause the fuel in the reservoir and fuelconduit. to be vaporized. The valve 3 is preferably closed or partlyclosed during this initial vaporization and when the burner has beenheated to the desired extent the valve is opened to permit the vapor,which is under high pressure, to escape through the inlet port into theflame tube where it is ignited by the flame in the generating cup andwhere it mixes with the air and'burns with a blue flame of intense heat.The arrangement of the fuel conduit with relation to the ame tube issuch that it is subjected to an intense heat which quickly converts thefuel into vapor under high pressure. This intensely hot and completelyvaporized fuel burns with a clear blue flame having an intense heat,which is the ideal sought for in burners of this type, but. it has beenfound that the pressure iluctuates so that the fuel is not fed uniformlyto the llame tube, thus causing a flickering or spitting of the flame.This objectionable feature is overcome by providing the reservoir orequalizing` chamber 21. When the pressure in the fuel conduit exceedsnormal pressure the excess fuel will be forced into the equalizingchamber and confined under pressure and, when the pressure in the fuelconduit drops, this fuel will. escape. to the inlet port 2, thusproviding additional fuel and boosting the flame. In this manner thefluctuations in pressure are avoided and a uniform flow of fuel isprovided which results in a steady flame. Another result produced bythis construction of the burner is the constant flow of fuel from thetank 5 to the burner. After the fuel in the tank has been initiallysubjected to air pressure a constant flow of fuel will be maintained tothe burner until the tank is exhausted without. the necessity ofrepeatedly pumping air into the tank, as is usually necessary.

While I have shown and described one embodiment of my invention I wishit to be understood that I do not desire to be limited to the detailsthereof as Vvarious modifications may occur to a person skilled in theart.

Havingv now fully described my invention, what I claim as new and desireto secure by Letters Patent, is:

1. A burner of the character described, comprising a flame tube having-avalve controlled inlet port at its rear end, aV fuel conduit formedintegral with said tube, extending transversely through the same,extending rearwardly through the upper wall thereof and downwardly`through the rear wall thereof to said inlet port, and an equalizing'chamber formed in the rear wall thereof and communicating with said con-2. A burner of the character described, comprising a flame tube havingan inlet port in its rear end wall and having` a boss depending;therefrom beneath said inlet port, a fuel conduit formed integral withsaid flame tube, extending upwardly thrcirghV the same, rearwardly alongthe top wall thereof and thence downwardly through the rear wall of saidtube into said boss, the lower end of said conduit being` closed to forma reservoir beneath said inlet port, a needle valve extending` throughthe last mentioned portion of said fuel conduit and adapted to controlsaid inlet port, that portion of said valve which extends throughl saidconduitV being of less diameter than said conduit to provide opencommunication between said conduit and said reservoir. f

In testimony whereof, I affix my signature hereto.

LLOYD S. JGHNSON.

